TIL canvas.captureStream() is video-only — here's how I mixed voiceover + music into a MediaRecorder export" published: true

1. 1Use canvas.captureStream() to capture the video track from a canvas element
2. 2Create a separate audio stream using a library like Web Audio API or a media element
3. 3Merge the video and audio streams using the MediaStream API
4. 4Create a MediaRecorder instance to record the merged stream
5. 5Configure the MediaRecorder to export the recording as a video file

This benefits frontend engineers and web developers who work with multimedia and need to record audio and video from canvas elements.

💡 canvas.captureStream() only carries video tracks, so you need to merge it with an audio stream to get a complete multimedia recording

💡 Did you know canvas.captureStream() only captures video? Learn how to add audio to your MediaRecorder exports!